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Old   November 8, 2011, 04:34
Default Second derivative at wall
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Ivan Flaminio Cozza
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Hi Foamers,
I need to implement a slip wall b.c. in second order approximation, that reads:

U = A + B(Kn)*(dU/dn + d2U/dn2)

where U is the velocity at wall, n is the wall-normal direction, A is a constant B(Kn) is a function of the local Knudsen number.

Does someone have an idea on how to get the d2U/dn2? Is it implemented in stuff like groovyBc?

Thanks in advance,
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